1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <signal.h>
      20  #include <internal-signals.h>
      21  
      22  /* If ACT is not NULL, change the action for SIG to *ACT.
      23     If OACT is not NULL, put the old action for SIG in *OACT.  */
      24  int
      25  __sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
      26  {
      27    if (sig <= 0 || sig >= NSIG || is_internal_signal (sig))
      28      {
      29        __set_errno (EINVAL);
      30        return -1;
      31      }
      32  
      33    return __libc_sigaction (sig, act, oact);
      34  }
      35  libc_hidden_def (__sigaction)
      36  weak_alias (__sigaction, sigaction)